This is a link that will help you figure on how much is enough..
http://www.rvsolarelectric.com/index...directory_id=3
I have six 8D batteries that run off my 2000 w/inverter.. I run a household fridge overnight along with the tv and some 12 & 110v lighting.. i need to recharge by the next am just after coffee.. I figured I would need a rooftop full of panels to avoid runnig the gen....